Just got around 7k on the front for some P-zeros. Inside is quite badly worn, so thats why I was changing, however probably got about 2/3mm on centre still.
Rears, however still have around 4mm and they were on the car when I bought them (18,000 miles ago) Thinks rears last forever
Also just quickly, with slightly stretched tyres, good idea to run more or less than recommended pressure?